[ninefathom]

xterm? Never heard of it.

In all seriousness though... sorry, friend - that's a negative re: xterm vt420 compatibility.

Quoting from the [current] author's own website at invisible-island.net/xterm/ :

"[xterm] also implements most of the control sequences for VT220, as well as selected features from other DEC terminals such as VT320, VT420, and VT520."

That "selected features" bit is why I keep the real glass one around. Paging is probably the most deficient area that I really notice.